Definitely request a copy of both appraisals and have your agent review the information with you. Check out the comparison properties used and find out what the reductions were based on. The difference seems to be out of the ordinary in this market/environment. Look at the details to see if there is a middle ground.
The main question is what does your lender say about the two appraisals? Which one are they going to accept? That will tell you the chances of it being resolved.